/imports
/imports/knockout
knockout-3.0.0.js
/typings
knockout.d.ts
ko.ts
sample.html
sample.ts
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/**
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 * Pretend base class.
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 */
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class Fruit {
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}
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/**
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 * Derived class.
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 */
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class Apple extends Fruit {
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  constructor(public color: string) {
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    super();
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  }
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}
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function some() {
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  var f = new Fruit();
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}